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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preference shares
Common shares
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Beginning balance at Dec. 31, 2017   $ 400,000 $ 40,024 $ 37,355 $ 224 $ 3,913,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   250,000 0 0    
Offering expenses       (7,883)    
Change in redeemable noncontrolling interests       340    
Exercise of options and issuance of restricted stock awards     242 12,583    
Change in net unrealized gains on investments, net of tax $ (1,707)       (1,707)  
Foreign currency translation adjustments, net of tax 0       0  
Net income 392,903         392,903
Net income attributable to redeemable noncontrolling interests (90,822)         (90,822)
Dividends on common shares (39,600)         (39,611)
Dividends on preference shares (20,899)         (20,899)
Ending balance at Sep. 30, 2018 4,886,521 650,000 40,266 42,395 (1,483) 4,155,343
Beginning balance at Jun. 30, 2018   650,000 40,263 35,094 (1,101) 4,135,805
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 0 0    
Offering expenses       615    
Change in redeemable noncontrolling interests       13    
Exercise of options and issuance of restricted stock awards     3 6,673    
Change in net unrealized gains on investments, net of tax (382)       (382)  
Foreign currency translation adjustments, net of tax 0       0  
Net income 48,829         48,829
Net income attributable to redeemable noncontrolling interests (6,440)         (6,440)
Dividends on common shares           (13,143)
Dividends on preference shares (9,708)         (9,708)
Ending balance at Sep. 30, 2018 4,886,521 650,000 40,266 42,395 (1,483) 4,155,343
Beginning balance at Dec. 31, 2018 5,045,080 650,000 42,207 296,099 (1,433) 4,058,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 1,739 248,259    
Offering expenses       0    
Change in redeemable noncontrolling interests       (361)    
Exercise of options and issuance of restricted stock awards     206 16,169    
Change in net unrealized gains on investments, net of tax 1,880       1,880  
Foreign currency translation adjustments, net of tax 4,541       4,541  
Net income 909,927         909,927
Net income attributable to redeemable noncontrolling interests (204,091)         (204,091)
Dividends on common shares (44,500)         (44,547)
Dividends on preference shares (27,567)          
Ending balance at Sep. 30, 2019 5,951,235 650,000 44,152 560,166 4,988 4,691,929
Beginning balance at Jun. 30, 2019   650,000 44,162 552,210 (3,869) 4,670,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares   0 0 0    
Offering expenses       0    
Change in redeemable noncontrolling interests       (145)    
Exercise of options and issuance of restricted stock awards     (10) 8,101    
Change in net unrealized gains on investments, net of tax 608       608  
Foreign currency translation adjustments, net of tax 8,249       8,249  
Net income 107,944         107,944
Net income attributable to redeemable noncontrolling interests (62,057)         (62,057)
Dividends on common shares           (15,108)
Dividends on preference shares (9,189)          
Ending balance at Sep. 30, 2019 $ 5,951,235 $ 650,000 $ 44,152 $ 560,166 $ 4,988 $ 4,691,929